The Queen of England made her announcement... if William and Kate's baby is in fact a female, she will be called "Her Royal Highness" and "Princess."
The decision was made official on December 31, but Queen Elizabeth publicly announced it on Wednesday, Kate Middleton's 31st birthday in the London Gazette:
"The Queen has been pleased by Letters Patent under the Great Seal of the Realm dated 31 December 2012 to declare that all the children of the eldest son of the Prince of Wales should have and enjoy the style, title and attribute of royal highness with the titular dignity of Prince or Princess prefixed to their Christian names or with such other titles of honour."
Without the new decree, a boy would have been called a Prince, but a girl would have been titled "Lady," as she would not have been first in line to succeed to the throne.
The Queen's formal declaration is in line with Parliament's plan to make an amendment that would allow for any royal baby, no matter its gender, to become the heir to the throne of England. In other words, the Queen's actions signal that she supports the idea that a female child born first would succeed to the throne.
"By issuing a formal decree to ensure the title of prince and princess to all the future children of the Duke and Duchess of Cambridge, the Queen showed her support for reforms to gender equality,"
Victoria Arbiter, ABC News Royal Contributor says...
"She also managed to eliminate at least one excuse for any sibling rivalry."